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					                                DCI Bolt Tightening Torque Recommendations

 Improperly or inadequately pre-tensioned bolting can lead to the loading applied to the bolts not being
 held into place. DCI recommends following the chart to avoid reduced equipment service life, or
 damage and failure. These values have been based on lubrication of bolt threads with anti-seize.
 Remember these values are only recommendations and other factors such as dry threads, damaged
 threads, and friction can play a factor in applying the correct pre-tension in a bolt and DCI, Inc. can not
 be held accountable for these factors. The following chart has been compiled to be used for bolting of
 all DCI equipment unless otherwise specified elsewhere.

                                                       SAE Grade 5 Low Carbon               18-8 / 316 Stainless Steel
              Bolt Size                                      Steel Bolts                               Bolts
                                                                      (ft.-lbs.)                     (ft.-lbs.)
                 1/4"-20                                                 5.4                            6.3
                 1/4"-28                                                 7.5                            7.8
                5/16"-18                                                10.8                           10.8
                5/16"-24                                                11.6                           11.8
                 3/8"-16                                                17.7                           19.7
                 3/8"-24                                                19.3                           21.6
                7/16"-14                                                28.2                           31.3
                7/16"-20                                                30.1                           33.3
                 1/2"-13                                                38.8                           43.1
                 1/2"-20                                                40.6                           45.1
                9/16"-12                                                51.1                           56.8
                9/16"-18                                                55.7                           62.7
                 5/8"-11                                                83.3                           92.5
                 5/8"-18                                                95.0                          103.7
                 3/4"-10                                               104.9                          127.5
                 3/4"-16                                               102.5                          124.2
                 7/8"-9                                                159.9                          194.0
                 7/8"-14                                               159.3                          193.2
                   1"-8                                                236.0                          286.7
                  1"-14                                                213.5                          259.2
                1 1/8"-7                                               340.0                          413.0
                1 1/8"-12                                              322.0                          390.0
                1 1/4"-7                                               432.0                          523.0
                1 1/4"-12                                              396.0                          480.0
                1 1/2"-6                                               732.0                          888.0
                1 1/2"-12                                              579.0                          703.0

 DCI Wingnuts have been designed to apply the proper torque to the bolt when an average human
 being applies a "hand-tight" force to the wingnut with hands (creating 30-40 ft-lbs). No bars or
 extensions are to be used.




I:\Eng Knowledge\Documentation\Instructions\DCI Bolt Torque.xls.xls
7/29/01 Rev 10/31/02
BJU                                                                                1 of 1                                9/2/2003

				
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